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CpG islands--'a rough guide'.

Robert S Illingworth1, Adrian P Bird

  • 1Wellcome Trust Centre for Cell Biology, Michael Swann Building, University of Edinburgh, Mayfield Road, Edinburgh EH9 3JR, United Kingdom. rillingw@staffmail.ed.ac.uk

FEBS Letters
|April 21, 2009
PubMed
Summary

CpG islands (CGIs) are DNA regions usually unmethylated near genes. CGI methylation in cancer silences genes, but also occurs in normal tissues, potentially regulating cell identity.

Area of Science:

  • Genomics
  • Epigenetics
  • Molecular Biology

Background:

  • Mammalian genomes contain CpG islands (CGIs), DNA regions rich in CpG sites, typically unmethylated and located near gene promoters.
  • DNA methylation of CGIs is observed in malignant cells, leading to gene silencing, and also in normal processes like X-inactivation and imprinting.
  • Tissue-specific CGI methylation patterns suggest a role in transcriptional regulation during cell differentiation.

Purpose of the Study:

  • To investigate the role and location of differentially methylated CpG islands (CGIs) across various tissues.
  • To explore the potential regulatory functions of tissue-specific CGI methylation, particularly those located distal to gene promoters.

Main Methods:

  • Genome-wide analysis of DNA methylation patterns.

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  • Identification and characterization of CpG islands (CGIs).
  • Comparison of methylation profiles across different mammalian tissues.

    • Main Results:

    • Confirmed association of CGIs with gene promoters and their typical lack of methylation.
    • Documented instances of CGI methylation in both cancerous and normal tissues, including roles in X-inactivation and imprinting.
    • Identified numerous tissue-specific methylated CGIs, many located at distal regulatory regions.

    Conclusions:

    • CGI methylation is a significant epigenetic mechanism involved in gene regulation across various biological contexts, including normal development and disease.
    • Tissue-specific CGI methylation patterns highlight their potential role in establishing and maintaining cell identity.
    • The regulatory function of promoter-distal methylated CGIs requires further investigation.